As far as I can tell, there isn't a separate forum for each language. Right now, it's all lumped together since most of the RAD IDE selections are the same across the languages. Only the coding is different.

If you really want language-specific (even version-specific) sections, check out StackOverflow instead. It uses a tagging system to categorize questions, and the Delphi tags are very active, and the C++Builder tags to a lesser degree.